Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4d2a7df3f219f2…

MALICIOUS

PDF

86.9 KB Created: 2021-02-23 22:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 47d6f5849aeca53fff637a87f8a83571 SHA-1: 1d4971983e8658c8db63397341bc7d5ce826fc08 SHA-256: 8c4d2a7df3f219f2cc00e1b4b479d269f9cf58fc3048a593fe10867428a0e7ac
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URL that directs to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature, flagging it as a phishing trojan. The document body, though heavily obfuscated, contains text that appears to be a lure for the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=long+haired+mini+dachshund+blue+eyes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381532/normal_6029535f8ca2f.pdfIn PDF document text
    • https://cdn.sqhk.co/vabedesi/isHKBEX/kukuwun.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/diaihdi/football_games_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_602b7fbd63cd6.pdfIn PDF document text
    • https://cdn.sqhk.co/tupujokuz/Aibrjpv/architecture_draw_sketch_paint_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_601e81b074d04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380543/normal_600840c49c9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_60251c0cbf133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/affine_function_vs_linear_transformation.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/be-_tech_safety_box_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/wheres_waldo_costume_plus_size.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/long_division_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/309799940.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/62046869372.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/introduction_to_conceptual_physics_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/checkbox_checked_and_unchecked_in_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/rezepifub.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/world_report_2019_vietnam_human_rights_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/choose_video_from_gallery_android_example.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/autel_evo_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/adobe_acrobat_reader_free_windows_8._1.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 5536 bytes
SHA-256: ed562dbf705ed1d0f61319565380fbb77ddf483d93b83fd86d9c4075cdc22734
font_01_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 12024 bytes
SHA-256: c6dd1ce5ba40029418f34f997f560a4f1d679332c3ac53a6c654635bb4df73fd